Cynebeald

A similar issue but with a long-term world (instead of conversion) is reported as MCPE-223708

See also MCPE-223914 (even contains a screenshot of an empty world list with the same issue on PS5):

Either Minecraft forgets to delete data from the save file, the actual file sizes are misrepresented or the check for the “full storage” is based on the physical size of the storage file which might be a database that contains empty space after deleting worlds (so Minecraft doesn't “shrink” the file and once you reach the limit youre done).

I encountered a similar issue but instead of having a long-term world, I bloated the save file size when converting old PS4 worlds to the PS5 version of the app - I added a comment to MCPE-194548 .

Either Minecraft forgets to delete data from the save file, the actual file sizes are misrepresented or the check for the “full storage” is based on the physical size of the storage file which might be a database that contains empty space (so Minecraft doesn't “shrink” the file).

I encoundeted a similar issue, 1.21.93 - after importing about 150 worlds (of 185) from the PS4 version to the PS5 version I now have a bloated 9GB save file, deleting worlds does not seem to free up any space and the PS5 version does not allow backups of individual worlds.

The save file (as reported by PS5) is 9GB (9.57GB to be exact)

So the PS5 version says it doesnt have any free space - “Storage is almost full. Delete data from Settings to enter a world” and “8.9GB used out of 9GB”

However, the settings screen only shows 1.7. GB of worlds:

With the largest occupying only 62MB:

I already cleared all the caches several times.